Grinding machine



E. a. SEARDNER ET AL GRINDING MACHINE Filed Aug. 18, 1924 3 Sheets-Sheet1 gjm ww Dec. 1, 1925 1,563,900 E. B.(3AJ?EHUEFQ ET AL GRINDING MACHINEFiled Aug. 18, 1924 3 Sheets-Sheet 2 Dec. 1 1925.

E. a. GARDNER ET AL GRINDING mcnxun Filed Aug. 18, 1924 3 Sheets-Sheet 5Patented Dec. 1, 1925.

UNITED STATES EDWARD B. GARDNER, RALPH D. GARDNER, AND JOHN NIELSEN,

wIscoNsIN.

PATENT OFFICE. I

or IBELOIT,

GRINDING MACHINE.

Application filed August 18, 1924. Serial No. 732,602.

To all whom it may concern:

Be it known that we, EDWARD B. GARDNER, RALPH D. GARDNER, and JOHNNIELSEN, citizens of the United States, residing at Beloit, in thecounty of Rock and State of Wisconsin, have invented certain new anduseful Improvements in Grinding Machines, of which the following is aspecification.

1 This invention pertains to grinding 1na chines, and the presentapplication is directed-to improvements on the grinding mavide" meansfor angular-1y adjusting the supporting'links and the dressertool'relative to the adjacent face of the grinding wheel wherebyfthe"dresser" may be accurately ali nedwith the face of said wheel.

'Knother important objectof our invention is to provide the dresser withhardened metal bearings for pivotal connection with the supporting linksand to provide for adj istment thereofand at the same time retain thedresser in a vertical planecentrally between opposed grindingdiscs'wh'ereby the face of either disc may be dressed. I Other objectsand advantages of this inventionwill be apparent as the same becomesbetter understood by referring to the following description whenconsidered V with the accompanying drawings.

Referring to the drawings,

Fig. lis a rear elevation of a machine embodying our invention, 7 i

Fig. 2 is an end elevationlooking toward the left at Fig.1," 3

' Fig. 3 is-a side elev'ation'of the dressing tool, one end thereofbeingshown in section, Fig. 43is'a crosssectional view'taken' on line l4 ofFig-3,

. Fig. 5 1s a transverse sectional view showing the pivotal connectionbetween the dressing tool and one of the supporting links, and

6 is a plan view of the dresser supp rt showing the means for permittingthe angular adjustment thereof;

It will be observed by reference to the guideways 6. The respectiveguideways v6 support reciprocatory carriages 7 which are 4 provided withsuitable bearings in which the wheel carrying shafts 8 are respectivelyjournaled. Upon the inner end of each shaft 8 is fixed a grinding wheel9., These shafts 8 may be driven through the medium of pulleys 19, or byindividual'motors.

The carriages 7 together with the grindingwheels 9 are moved toward andfrom each other by a suitable mechanism operated through the medium of arock shaft 11'. This operating mechanism per se forms no part of thepresent invention and is fully shown and described in our co-pendingapplication referred to above. It'is sufficient to'state that thecarriages 7 are normally urged toward each other to cause an approachingmovement of the wheels 9, by an arm 12 which is fixedto the rock" shaft11, the arm-being'actuated grinding by "a weight 13 which is suspendedtherefrom. The rockshaft 11 is positively rocked in the-oppositedirection through the medium of-a cam mechanism driven from themaindrive shaft of the machine 14. The tip proaching movement of thegrinding wheelsis variably limited by a stop screw 15 which is carriedbyan arm 16 fixed to the rock shaft 11, said screw being set to engagean abutment shoulder '17 on the machine frame. j p v For the purpose ofdressing the opposed faces of the grinding wheels, we have mounted atthe rear of the machine upon a bracket 16, the supporting plate 19. Adresser tool 20 is pivotallysupported on said plate by parallel links21-21 so as'to permit said tool to bemoved radially of thegrindingwheels and in a substantially horizontal plane.

The dressing tool 20comprises a holder 22 and a cutter tool head 28-,the latter being provided with a shank 24 which fits within a bore 25extending inwardly from the end of the head 23. The tool head shankadapted'to be turned 180 about its longltudinal axis, and means areprovided for retaining the tool in either extreme positions ofadjustment. This means comprises diametrically opposed flats 26 formedonthe shank 24c and a set screw 27 mounted in the tend entirely acrossthe holder, and the outer holder for engagement with either flat.Mounted in the holder 22 in advance of the bore 25 are a pair of spacedhardened metal bearings 28. These "bearings 28 'ex-' ends of eachhearing are respectively formed with conical seats 29.

Each of the links 21 and their pivotal connections with the supportingplate 19 and the dressing tool 20 are identical and therefore thedescription of one link and its connections will sufiice. Each link isin the nature of a swinging frame having at itslower end a pair ofspaced depending bearing lugs 3030 which are respectively connected tothe plate 19 by means of pivot pins '31. The upper end of each link 21is formed with upwardly extending bearing lugs 32-32 which form aresultant recess 33 for receiving the dressing tool 20. The bearing lugs32 are respectively formed,

, in alignment. Adj-ustably mounted-in each of the bearing openings 34is a bearing pin 35 having a tapering inner end 36rfo-r engagement withthe adjacent seat 29 of the associatedbearing 28. These bearing pins 35are adj ustablelongitudinally of the openings 34 and are adapted to beheld in adjusted positions by set screws 32 mounted in the bearing lugs32. Thus, by means of these adjustable bearing pins 35 the pivotalconnections between them and the dresser tool 20 may be adjusted to anieety. 1

The supporting plate 19 and consequently the dresser tool '20 is mountedupon the bracket 18 for angular and longitudinal adjustments relative tothe face of the grinding wheel so as to make it possible for .theoperatorto properly align the tool with the face. To this end we haveprovided the bracket 18 with a fulcrum pin '37 which projects upwardlyinto a slot 37 formed in the plate 19. A pair of bolts 7 38 also projectupwardly from the bracket through slots 39, formed in the plate 19.These slots 39 may be a-rcuate or, if straight as shown in Figure 6,should be wide enough .to loosely accommodate the bolts 38 therethroughso that the plate 19 may be adjusted to the angular relation desired.The bracket is also provided with a pair of upwardly extending lugsdO-O, and each lug is equipped with an adjustable screw 41 which bearsagainst the adjacent face of the plate 19. Nhen adjustment of thedresser tool is required the bolts 38 are loosened, whereupon by turningthe screws ll in the proper directions, the dresser tool together withsupporting links may be swung in a horizontal -pla:ne about the fulcrumpin 37 or moved longiti-idinally with respect to the wheels, or both, toproperly align the tool with the faces of the grinding wheels, asdesired. After this adjustment has been made, the bolts 38 are tightenedto lock the dresser tool in itsadjusted position. It should be notedthat these adjustments are merely coarse adjustments to approximatelyposition the dresser centrally between the grinding wheels and thatfiner adjustment is taken care of by moving the grinding wheelsindividually toward the dresser when the bracket 18 is locked. v 1

In operation,.the dresser tool head is first adjusted about its axis soas to co-operate with the facev of one 0f the grinding wheels, The toolis then lined up withsaid grinding wheel face, and the operator, bygrasping the outer end of the tool holder 22, swings the dresser toolback and forth radially of the wheel and in engagement therewith, themovement of the vtool beingrin a substan tially horizontal plane whichpreferably im tersects the axis of the wheels.v After one wheel has beensurfaced, the operator then;

oscillates the tool head about'and are: of 1180", secures the same inposition by the set screw 27, and then moves the dresser tool back andforth across the face of the-other wheel.

o claim: 7 V I i 1. In a grinding machine, the combination with a rotarygrinding wheel, of asupport located at one side of theaxislof saidwheel,

a tool for surfacing one face of said wheel andra pair of parallel linksrespectively pivoted to said support and tool .for permitting the toolto be moved'substantially radially of thewheel. a

2, In agrinding machine, the combination with spaced rotary-grindingwheels, ofa support located at one side of the axis of said wheels, atool for surfacing the faces of said wheels, said tool being positionedbetween the wheels and comprising a holder and a tool head connected tothe inner end of said holder, said connection between the tool head andthe; holder including means 7 for permitting the oscillation of the toolabout an arc of approximately .180, means for securing said tool head tothe holder in either extreme position of adjustment,

means for pivotally mountinghsai dl tool onsaid support for permittingsaid to be moved substantially radially of the I wheels.

3. In a grinding machine the combina tion with spaced rotary grindingwheels, :of a support located at one, side of theaxis of said wheels, atool for surfacing the faces :of said wheels, said tool being positionedbetween the wheels and comprising a holder and a tool head connected tothe inner endof said holder, said connection between the tool head andthe holder including means for permitting the oscillation of the toolabout an .arc of approximately 180, means for securing said tool head tothe holder in extending inwardly from the inner end thereof and a toolhead having a shank mounted in said bore, a pair of spaced metalbearings extending transversely of the holder in advance of the shank,and a pair of parallel links respectively pivoted to said support and tothe metal bearings of said holder for permitting the tool to be movedsubstantiallyradially of the wheel.

.5. In a grinding machine, the combination with a rotary grinding wheel,of va support:

located at one side of the axis of said wheel, a tool for surfacing oneface of said wheel, said tool comprising a holder having a boreextending inwardly from the inner end thereof and a tool head having ashank mounted in said bore, a pair of spaced metal bearings extending,transversely of the holder in advance of the shank, and a pairofparallel links respectively pivoted to said support and to the metalbearings of said holder for permitting the tool to be movedsubstantially radially of the wheel, the pivotal connection between eachlink and the holder com rising a pair of spaced bearing pins carried therespective ends of the associated metal bearing.-

,6. In a grinding machine, the combination with a rotary. grinding,wheel, of a support 1 located at one side of the axis of said wheel,

a tool for surfacing one' fa'ce of said wheel, saidtool comprisingaholder having a bore extending inwardl from the inner end thereof and atool head having a shank mounted in said bore, and a pairof parallellinks-respectively pivoted to said support and to the metal bearings ofsaid holder for permitting the t'ool to be moved substantially radiallyoi the wheel, the "jivotal' connection "between'each link and theolderfcomprising by the link and engageable with a pair of spacedbearingpins carried by the link and engageable with the respective ends of theassociated metal-bearing, said bearing pins being laterally adjustable,and means carried by the link for securing said pins in adjustedposition.

7 In a grinding machine, the. combination with a rotary grinding wheel,of a sup ort located at one side of the axis of said wl ieel, a pair ofspaced links pivoted to the sup ort for rocking movements towards androm the axis of said wheel, the upper end of each link being recessed toform resultant spaced lugs, a tool located within the recesscs of saidlinks, and means for pivotally connecting said tool to the spaced lugsof each link,.whereby said tool may be moved substantially radially ofthe wheel to surface the adjacent face of said wheel.

8. In a grinding machine, the combination with a rotary grinding wheel,of a support located at one side of the axis of said wheel, a pair ofspaced links pivoted to the support for rocking movements towards andfrom the axis of said wheel, the upper endof each link being recessed toform resultant spaced lugs, a tool located within the -recesses of saidlinks, and means for pivotally connecting said tool to'the spaced lugsof each link, whereby said tool may be moved substantially radiallyofthe wheel to surface the adjacent face of said wheel, said pivotalconnection between the tool and each link comprising a transverselydisposed metal bearing carried by the holder and bearing pinsrespectively carried'by the lugs of the associated link and having meansto adjust said ins.

9. n a grinding machine, the combination with a rotary grinding wheel,of a support located at one side oftthe axis of said wheel, a tool forsurfacing one face of said wheel, a pair of parallel links respectivelypivoted to said support and tool for permlttlng the tool to be movedsubstantially radially of the wheel,.and means'forl an'gularly ad'ustingsaid'su'pport relative to the plane 0 the grinding wheel. t t

EDWARD B. GARDNER. RALPH-D. GARDNER. JOHN "NIELSEN.

